Air feed and vent for closed-top gas stoves



Feb. 23 1926. 1,574,079

J. B. GARDNER AIR FEED AND VENT FOR CLOSED TOP GAS STOVES Filed May 11, 1925 n In; h-

/ I W I/ INVEN TOR.

Patented Feb. 23, 1926 UNITED STATES -l-ATENT OFFICE.

JOSEPH IB. .GARDNER, OF OAKLAND, CALIFORNIA, ASSIGNOR TO HAMMER-EBAY COH- PANY, OF OAKLAND, CALIFORNIA, A CORPORATION OF CALIFORNIA.

AIR FEED AND VENT FOR CLOSEDTOP GAS STOVES.

Application filed May 11, 1925.

To all whom it may concern:

Be it known that I, JOSEPH B. GARDN R, a citizen of the United States, and a resident of Oakland, county of Alameda, and State of California, have. invented a new and useful Air Feed and Vent for Closed-Top Gas Stoves, of which the following is a specification.

The invention relates to means incorporated with a burner chamber of a closed top gas stove, for insuring an adequate supply of fresh air to all of the burners in the chamber.

Most gas stoves, particularly ranges, are equipped with front and rear gas burners which are positioned in what may be termed a burner chamber. \Vhere a grate has been superposed over the burners to provide a cooking top, no difficulty has been experienced in the matter of an adequate external supply of fresh air at the burners. However, when the burner chamber has been covered with a closed or solid top, it has been found that the rear burners receive less fresh air for combustion than do the front burners, since the burner compartment is usually open only at the front and such fresh air that flows by the front burners escapes into the flue ventat the rear of the chamber, without the desired contact with the rear burners. Various attempts have been made to remedy these difficulties, but in general the results obtained thereby have not been satisfactory. The reason I believe lies in the fact that too little" attention was given to the effect of the location of the-"burnt gas discharge opening or open ings upon the flow of the fresh air chamber.

Furthermore, the structures involved in such attempts in most instances require forming the bottom and top plate in such manner as to necessitate the use of a special drip-pan and render the complete removal of such top plate impractical. In accordance with the foregoing it is my object to insure adequate supply of fresh air to all the burners in the chamber without entailing the objectionable features referred to.

The invention possesses other objects and features of advantage, some of which, with the foregoing, will be set forth in the following descrlption of the preferred forms of my invention which are illustrated in, the drawings accompanying and forming part of the specification. Itis to be understood Serial No. 29,365.

that I do not limit myself to the showing made by the said drawings and description, as I may adopt variations of the preferred forms within the scope of my invention as set forth in the claims.

Referring to said drawings:

Figure 1 isa perspective view of the cookng top portion of a stove embodying my invention.

Figure 2 is a vertical section of the stove portion, illustrated in Figure 1 and taken on the line 22 thereof.

Figure 3 is a perspective view similar to Figure 1, illustrating another embodiment of the invention.

Figure 4 is a'vertical section taken on the line 3 3 of Figure 4.

Br efly expressed, my invention comprises, providing a fresh air inlet at the rear as well as at the front of the chamber, and further providing a passage directly into the central portion of the chamber from either such rear inlet or the vent for the com bustion products so that upon the discharge of the combustion products into the vent, the a1r entering from the rear inlet will be caused to move toward the center of the chamber and consequently against the rear burners, in substantially the samt-s manner as the air entering from the front inlet ,is

caused to be directed againstg the front burners.

In the drawings, as previously -'noted .there are illustrated two embodiments of the'invention. One embodiment utilizes a assage from the vent to cause the air to ow toward the central portion of the chamber whereas the other embodiment utilizes for such purpose a passage from the rear freshair inlet.

In Figures 1 and 2, in which are illustrated the first mentioned embodiment, the stove 4 is provided with a closed gas-cocking-top 6 which includes a top-gas-burner' sired a grate (not shown) may be substi: I

lids 18. The compartment 7 tuted therefor. Openings 17 are provided in the plate 14 and are normally covered by is formed rather shallow in order that a maximum space may be available.thereunder for other uses. Arranged in the compartment are front and rear 'top-gas-burners 19 and 21 which are preferably aligned with the openings 17 of the cooking plate.

A proper gas mixture for the burners is arranged to be supplied thereto through pipes 22 provided with air mixers 23 and connected to a gas manifold 24 at the front of the stove. In most types of closed top gas stoves at least part of the fresh air for completing combustion at the burners is arranged to enter directly into the compartment through the opening or space 25 extending across the bottom portion of the front plate 26 thereof and the products of combustion are arranged to discharge di iectly into a vent located at the rear of the compartment. Such location of the vent with respect to the fresh air inlet, while affording a proper supply of fresh air to the front-burners, causes the air vitiated at the front burners to be drawn over the rear compartment, additional fresh air for the rear burners is best brought from the rear of the chamber. It will be clear, however, that any attempt to provide fresh air inlet openings at the rear of the chamber with the vent likewise located, will cause the fresh air from said inlet to be drawn into the vent withoutmaterially associating with the rear burners. In accordance with the present invention, I so arrange the intake of the vent that the use of fresh air inlet openings atthe rear of the chamber is made fully effective to furnish an adequate supply of fresh air at the rear burners. Accordingly, one or more openings 29 are provided in the rear wall 12 through which fresh air is arranged to be drawn directly into the chamber from without the stove. Registering with a vent opening 31, preferably provided in the wall 12, are internal and external flue portions 32 and 33 respectively. The internal flue portidn 32 comprises branches 34 which extend to and along the opposite side walls 8 and 9 of the chamber and have their inlet openings 36 located opposite the space between the adjacent front and rear burners. The openiings 36 are disposed in a plane above that of the fresh. air inlets at both the front and rear of the chamber, so that the combustion products will move to the flue by convection. It will thus be noted that communication of the flue with the chamber is effected only throughthe medium of the flue openings 36.

It will now be clear that a fresh air supply is provided for the front and rear burners independently, and that by reason of the location of the flue openings in the chamber, the vitiated air from a front burner will rot associate with a rear burner.

The flue branches are positioned well toward the top of the chamber 7 so that obstruction of the chamber is avoided and a full-sized drip pan of maximum size may he placed therein. Furthermore, the branches 34 are preferably formed separately of the top member 15 to thereby permit the removal of the top section 14.

Another arrangement for preventing the vitiated air from the front burners from circulating over the rear burners, and furnishing the latter with an independent supply of fresh air is shown in Figures 3 and 4. in this arrangement, fresh air for the rear burners is drawn into the chamber through inlet openings 41 formed in the rear wall 12 of the chamber and positioned adjacent the side walls 8 and 9 thereof. The fresh air from such openings is caused to flow in streams inwardly and adjacent the sides of the chamber, and then caused to pass over the rear burners before its discharge from the chamber is permitted. As here shown, passages +12 throughwhich the incoming air is directed toward the central portion of the chamber are defined between the bottom '13 and a plate 43, and the side walls of the chamber and partitions 44. The plate 43 is positioned against the rear wall of the chamber and'scparates the intake openings from the vent opening 46 of the flue, it being noted that the vent opening is positioned above the plate, while the inlet openings and the pasrages 42 lie below the plate. Since the vent opening 46 is located opposite the space between the rear burners, the vitiated air from the front burners, in flowing to said opening, will, for the most part, pass through said space between the burners. F urthermore, the air from the passages 42, while and after passing over the rear burners, will not only supply the necessary aid to combustion at the latter, but will force the siream of vitiated air from the front burners to still greater confinementin the space between the rear burners. The bottom edges of the partitions 44 are preferably spaced from the bottom 13 of the chamber in order 7 that a drip-pan 30 may extend thereunder.

: posite sides thereof.

2. In a stove, a closed top-gas-burner chamber having fresh air inlet openings adjacent the front and rear thereof, front and rear burners within the chamber, and a burnt-gas discharge conduit for said chamber havingits inlet located in said chamber intermediate the front and rear fresh-air-inlet openings.

3. In a stove, av closed top-gas-burner chamber hav'ng fresh air inlet openings thereto at the front and rear thereof, front and rear burners in said chambers, and a discharge flue at the rear of the stove communieating with said chamber at each of the op- 4. In a stove, a closed top-gas-burner chamber having fresh air inlet openings thereto adjacent the bottom of the front and rear thereof, front and rear burners positioned in said chamber, and a discharge flue having an entrance opening in said chamber at each side of the burners substantially opposite the portions thereof lying adjacent each other.

5. In a stove, a closed top-gas-burner chamber having fresh air inlet means of substantially equal capacity at the front and rear thereof, and burners in said chamber adjacentthe front and rear thereof.

6. In a' stove, a closed top-gas-burner chamber having a fresh air inlet of substantially equal capacity at the front and rear thereof, and a burnt-gas outlet of substantially equal capacity arranged in said chamher at each side thereof.

7. In a stove, a closed top-gas-burner chamber having a fresh air inlet thereto from the rear of the stove, and a burnt-gas discharge opening in said chamber located at adjacent a side thereof intermediate the front and rear of the chamber.

8. In a stove, a closed top-gas-burner chamber provided with a fresh air inlet at the front of the stove and a fresh air inlet at the back of the stove, a fine pipe at the back of the stove having branches positioned in a hFgher plane than said intakes and extending into the chamber with their intake ends at the opposite sides of the chamber mediately of the front and rear, and sets of top-gas-burners arranged within said chamber forwardly and rearwardly of said branch flue intakes.

9. In a stove provided with a closed topgas-burner chamber, sets of top-gas-burners in said chamber adjacent different sides thereof, means adjacent said sides of said chamber through which fresh air may be introduced into the chamber, and means through which the burned gases from said chamber may be discharged therefrom intermediate said sides of the chamber.

In testimony whereof, I have hereunto set my hand at Oakland, California, this 4th day of May, 1925.

JOSEPH B. GARDNER. 

